The noise standards for dry-type transformers are mainly regulated by Chinese industrial and national standards, with separate requirements for conventional dry-type transformers and amorphous alloy core dry-type transformers. Meanwhile, there are corresponding norms in the international community as well. The specific standards are as follows:

　　1. Chinese Standards

　　1. Conventional dry-type transformers (based on JB/T 10088 - 2016): This is the core mechanical industry standard for the noise of dry-type transformers in China, which specifies the A-weighted sound power level limits for dry-type transformers with voltage levels of 6kV, 10kV, and 35kV. It should be used in conjunction with the sound level measurement method specified in GB/T 1094.10. The noise limits for some common capacity specifications of 6kV and 10kV dry-type transformers are widely referenced in practical applications as follows:

　　|Rated Capacity (kVA)|Noise Limit (dB(A))|Rated Capacity (kVA)|Noise Limit (dB(A))|

　　| ---- | ---- | ---- | ---- |

　　|50|60|630|67|

　　|100|61|800|68|

　　|160|62|1000|68|

　　|200|63|1250|70|

　　|315|65|1600|70|

　　|500|67|2500|72|

　　2. Amorphous alloy core dry-type transformers (based on GB/T 22072 - 2018): This standard targets dry-type distribution transformers with amorphous alloy cores. Since amorphous alloy materials have weaker magnetostriction effects compared to traditional silicon steel sheets, their noise level is significantly lower than that of conventional dry-type transformers. Although the specific noise value table is not fully listed, the standard emphasizes noise control through structural optimization such as neat iron core structure design, which helps reduce iron core vibration and further lower noise.

　　3. Environmental labeling product requirements (based on HJ 2543 - 2016): This standard clarifies the environmental protection-related requirements for dry-type power transformers. It stipulates that the noise limits of amorphous alloy core dry-type transformers shall comply with GB/T 22072, while other types of dry-type transformers shall meet the requirements of JB/T 10088. Additionally, it requires manufacturers to provide installation and commissioning instructions conducive to reducing operational noise.

　　4. Energy-saving and low-noise group standard (based on T/ZZB 1424 - 2019): As a group standard with stricter requirements, it proposes that the noise level of three-phase dry-type transformers should be reduced by 3 - 5 dB(A) compared with the national standard GB/T 10228 - 2015. For example, the noise limit of 1000kVA dry-type transformers is set at 63 dB(A), which is 5 dB(A) lower than the 68 dB(A) specified in the corresponding national standard reference value.

　　2. International Standards

　　1. IEC 60076 - 10: This international standard provides guidelines for the measurement and limit of acoustic noise emitted by power transformers, including dry-type transformers. It specifies unified test methods for transformer noise and sets maximum allowable noise levels based on the rated capacity of transformers, which is widely recognized and adopted globally.

　　2. American NEMA Standards: The United States has formulated targeted standards through the National Electrical Manufacturers Association (NEMA). Among them, NEMA ST - 20 defines the noise limits for dry-type transformers below 1.2 kV and 1000 kVA; NEMA TR - 1 is applicable to medium-voltage dry-type transformers above 1.2 kV and within 7500 kVA, with noise limits formulated according to different capacity levels.